package com.spica.spicaschool.utils;

import android.app.Activity;
import android.graphics.Rect;
import android.os.Build;
import android.view.View;
import android.widget.FrameLayout;

/**
 * @ClassName AndroidBug5497Workaround
 * @Description TODO
 * @Author Spica2 7
 * @Date 2021/3/30 11:06
 */

public class AndroidBug5497Workaround {
  public static void assistActivity(Activity activity) {
    new AndroidBug5497Workaround(activity);
  }

  private View mChildOfContent;
  private int usableHeightPrevious;
  private FrameLayout.LayoutParams frameLayoutParams;
  private int contentHeight;
  private boolean isfirst = true;
  private Activity activity;
  private int statusBarHeight;

  private AndroidBug5497Workaround(Activity activity) {
    //获取状态栏的高度
    int resourceId = activity.getResources().getIdentifier("status_bar_height", "dimen", "android");
    statusBarHeight = activity.getResources().getDimensionPixelSize(resourceId);
    this.activity = activity;
    FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
    mChildOfContent = content.getChildAt(0);
    //界面出现变动都会调用这个监听事件
    mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(() -> {
      if (isfirst) {
        contentHeight = mChildOfContent.getHeight();//兼容华为等机型
        isfirst = false;
      }
      possiblyResizeChildOfContent();
    });
    frameLayoutParams = (FrameLayout.LayoutParams)
        mChildOfContent.getLayoutParams();
  }

  //重新调整跟布局的高度
  private void possiblyResizeChildOfContent() {
    int usableHeightNow = computeUsableHeight();
    //当前可见高度和上一次可见高度不一致 布局变动
    if (usableHeightNow != usableHeightPrevious) {
      //int usableHeightSansKeyboard2 = mChildOfContent.getHeight();//兼容华为等机型
      int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
      int heightDifference = usableHeightSansKeyboard - usableHeightNow;
      if (heightDifference > (usableHeightSansKeyboard / 4)) {
        // keyboard probably just became visible
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
          //frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
          frameLayoutParams.height = usableHeightSansKeyboard - heightDifference + statusBarHeight;
        } else {
          frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
        }
      } else {
        frameLayoutParams.height = contentHeight;
      }
      mChildOfContent.requestLayout();
      usableHeightPrevious = usableHeightNow;
    }
  }

  /**
   * 计算mChildOfContent可见高度 ** @return
   */
  private int computeUsableHeight() {
    Rect r = new Rect();
    mChildOfContent.getWindowVisibleDisplayFrame(r);
    return (r.bottom - r.top);
  }
}